Nimzo-Indian - 4.e3 - Botvinnik system
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. a3 Bxc3+ 7. bxc3
White pushes the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.
Black advances the king's pawn to e6. White develops the knight to c3. Black develops the dark-squared bishop to b4.
White plays the king's pawn to e3. Black castles kingside. White develops the light-squared bishop to d3.
Black pushes the queen's pawn to d5. White moves the a-pawn to a3. Black captures with the dark-squared bishop on c3, giving check.
White captures on c3 with the b-pawn.